The tropical depression, locally named Usman, brought heavy rains on Saturday, causing catastrophic flooding and triggering deadly landslides, the National Disaster Risk Reduction and Management agency said Monday.
In its latest official update, the agency said the death toll had climbed to 75 with a further 12 people injured.
At least 16 others are still missing in the regions of Bicol and Eastern Visayas, officials said.
The storm affected nearly 190,000 people, officials said, with dozens of areas facing power outages as a result of infrastructure damage. As many as 69 houses were damaged, with 41 of those totally destroyed.
The national disaster agency said the weather system was “no longer affecting any part of the country” but forecast light rain for some areas.
More than 100 people were killed by Mangkhut before it barreled into Hong Kong and southern China.
The worst storm to hit the Philippines in a generation occurred in 2013, when Super Typhoon Yolanda killed more than 6,000 people and displaced nearly 4 million others.